The Uses of NPG

Neopentyl glycol in resin synthesis

1. Synthetic saturated polyester resin

Did you know that saturated polyester resin, one of the two basic resins used in powder coatings, is made by polymerizing neopentyl glycol and aromatic diacids (including terephthalic acid, isophthalic acid and trimelliic acid). Because the neopentyl structure of neopentyl glycol can provide the famous shield protection in the molecular chain of polyester resins, powder coatings, high-solids coatings and coil coatings prepared from such resins have very excellent fluidity, flexibility, chemical stability, hydrolysis resistance, weather resistance, chlorine resistance, thermal stability and UV radiation resistance.

2. Unsaturated polyester resin synthesis

Neopentyl glycol is also widely used in the synthesis of unsaturated polyester resins. Unsaturated polyester is a polymer resin made by melting polycondensation reaction with unsaturated diacid, saturated diacid/diol. Since neopentyl glycol has two symmetric primary hydroxyl groups, it is a structure-symmetric diol, and the synthetic polyester has strong crystallinity; The unsaturated polyester resin synthesized by it makes the product have excellent corrosion resistance, chemical stability, low volatility, especially alkali resistance and hydrolysis resistance; If used in combination with isophthalic acid, it shows excellent mechanical properties. Commonly used in high-quality FRP products and high-grade gelcoats, storage tanks and pipes with high requirements for chemical resistance. The doubling of NPG’s application in this area in the next three years is a high probability event.

3. Alkyd resin synthesis

The alkyd resin coating strength, especially pollution resistance and weather resistance, synthesized with neopentyl glycol, adipic acid and trimethylolpropane, are outstanding. Alkyd resins produced from neopentyl glycol are mainly used as high-grade baking coatings such as oil-free alkyd resins, and can be used as self-drying paints, varnishes, coils, container storage tank paints, etc., although oil-based coatings are limited, but this aspect still exists.

4. Polyurethane synthesis

Neopentyl glycol can be used to synthesize polyester polyols, which are used to synthesize high-quality polyurethane flexible and rigid foams, as well as elastomers with good performance such as TPU. In the production of polyurethane wire enamel, if ethylene glycol is used as raw material production, the synthesis time is long, the solderability, salt water pinhole, heat resistance grade and hydrolysis resistance of the enameled wire film are limited, while the polyurethane obtained by replacing ethylene glycol with neopentyl glycol has better thermal decomposition stability and hydrolysis resistance, and the coated polyurethane wire paint film has better salt water pinhole resistance, insulation performance and thermal performance. Of course, there are also people who use neopentyl glycol as a chain extender for polyurethane synthesis.

5. Polyester thickener synthesis

Have you found that more than 90% of the common lubricating oil on the market is mineral oil, and its common disadvantage is poor biodegradability, causing chronic pollution to land, sea and rivers, and will accumulate in the organism and produce toxicity. The biodegradable lubricating oil synthesized from neopentyl glycol can effectively reduce the damage to the environment. In addition, neopentyl glycol can be used to synthesize polyester thickeners, which are required for advanced aviation lubricants with excellent thermal stability and viscosity regulation.

6. Neopentyl glycol can also be modified with PET

We know that polyethylene terephthalate (PET) is a semi-crystalline polymer that is widely used in fibers, films and engineering plastics and other fields, with a market volume of more than 50 million tons, but its thermal properties have a great impact on the processing performance of polyester (PET). We can expand the scope of use of polymers by improving their crystallization properties, glass transition temperature and melting point by using copolymerization modification. Copolymerization of neopentyl glycol into the polyester molecular chain can make the copolyester have better chemical stability, aging resistance, corrosion resistance, hydrolysis resistance and thermal stability, and can well slow down the crystallization rate of the copolyester, reduce Tg and melting point. This area is untapped and has great potential.

7. Other applications

The neopentyl structure of NPG also plays an important role in many antioxidants, antistatic agents, and flame inhibitors, especially the cyclic phosphite and amino hydroxylates of NPG, which are good antistatic additives. Neopentyl glycol itself (sometimes mixed with other diols) is added to polyamide, PVC, and chlorinated polyolefins to improve their thermal stability.

Neopentyl glycol hydroxyvalerate

1. Neopentyl glycol monoester hydroxyvalerate can also be used for fast-curing high-solids thermosetting coatings’ tire cord treatment with emulsion, high-solid overprint varnish, heat-curing water-soluble polyurethane, bis-methacrylate. Flexible primers and two-component topcoats for automobiles. Light-colored acrylate monomer, etc. The chemical name of hydroxyvalerate neopentyl glycol monoester is 2.2 a dimethyl 1 , 3 propylene glycol light base valeric acid mono ester (referred to as a single ester of valproate or HPHP), C A S registration number 1 1 15 -2 0-4, is an ester diol. Because HPHP has the characteristics of saturated tertiary carbon atoms in the molecular structure, long carbon chains, and ester groups, its performance is better than that of traditional diols. The polyester synthesized with it not only has good stability, but also increases toughness and swing, so that the paint film has stronger pressure resistance, wear resistance, flexural resistance and other advantages. This makes it a new generation of advanced polyols after neopentyl glycol, tri-light methylpropane and pentaerythritol.
2. Hydroxyvalerate neopentyl glycol diacrylate (HPHPDA) contains ester group, saturated tertiary carbon atomic structure, its stability is good, and strong pressure resistance, wear resistance and flexural flexibility performance. As an important multifunctional monomer and diluent, hydroxyvaleric acid neopentyl glycol diacrylate has the advantages of high double bond content, fast curing speed and excellent curing film performance, and is widely used in light-curing inks, coatings and other fields. When hydroxyvaleric acid neopentyl glycol diacrylate is applied to solder mask inks, it is superior to bipentaerythritol hexaacrylate in terms of properties such as adhesion, solder resistance, chemical resistance, pencil hardness, printability, gloss and color.